The difference between Grouchy and Tetchy
When used as adjectives, grouchy means irritable, whereas tetchy means easily annoyed or irritated.
check bellow for the other definitions of Grouchy and Tetchy
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Grouchy as an adjective (originally, student slang):
Irritable; easily upset; angry; tending to complain.
Examples:
"His boss gets grouchy when deadlines draw near."
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Tetchy as an adjective:
Easily annoyed or irritated; peevish, testy or irascible.